Electric lamp



Feb. 17, 1931. J. HAMBERGER 1,793,398

ELECTRI C LAMP Filed Jan. 11, 1928 Patented Feb. 17, 1931 PATENT OFFICEJOHN HAMBEBGER, b! RICHMOND HILL, NEW YORK ELECTRIC LAMP Applicationfiled January 11, 1928. serial No. 246,045.

This invention relates to improvements in electric lamps, one object ofthe inventlon being the provision of a lamp bulb for use in theheadlight of an automobile and which is rovided with means whereby therays there rom may be so controlled as to provide a glare light duringordinary driving and a courtesy or dimmer light when passing anotherautomobile. A

Another object of this invention is the pro Vision of a light bulb ofthis type in which two filaments are provided, the filament to produce abright light being "located at the focal point of the bulb and thedimmer or courtesy filament being of smaller capacity and belng nearerthe tip of the bulb, means being provided for directing the raysof'light from the .latter filament so that the same will be projecteddownwardly upon the road or surface 2 traversed and, if desired, toeither side according to the customs of the country in which the lightis used.

Another object of this invention is the provision of an electric lightbulb of the type referred to which may be readily installed the presenttype of automobile headlights without the necessity of employing speciallenses for directing the rays and of which the two filaments may beenergized at will from the seat of the automobile.

In the accompanying drawings Figure l is a side elevation of an electriclamp bulb embodying this invention Figure 2 is a side elevation thereof,the bulb being shown in section;

Figure 3 is a rear end view of the lamp Figure 4 is a rear end view ofthe bulb havingpa modified form of base; igure 5 is an enlargedlongitudinal sectional view through the deflector for the dim mer orcourtesy light;

Figure 6 is a perspective view of the-de-' flector or reflector per se;and

Figure 7 is a vertical central sectional view through one form ofparabolic headlight having the present electric lamp bulb mpuntedtherein.

Referring to the drawings, a base 10 of non-conducting material isencased in the metal grounding sleeve 11, and this sleeve is providedwith the attaching lugs or projections 12 diametrically disposed, whilecarried by the base is a glass bulb B with the depression 1) at the apexthereof to produce a better illluminating effect for headlights onautomo- The contacts 13 and 14 are disposed at the flat end of the baseand are adapted to engage the necessary contacts within a socket 27,. aswill presently appear, while grounded to the sleeve 11 and supported inthe base and extended into the bulb is a'terminal and reflectorsupporting arm 15. Theforward portion of the arm 15 is bent at an angle,then transversely of the axis of the bulb as at 16 and then forwardly asat 17 substantially parallel to the axis of the bulb The portion 16 issubstantially at a right angle to the axis of the base and to the mainportion of the arm 15. A rod 18 extends longitudinally of the base andhas its rear end connected to the contact 14 and has its forward endconnected to one end of a filament 19, the other end of said filamentbeing connected to. the arm 15. The filament 19 constitutes the-mainfilament of the lamp and produces the brilliant light forordinarydriving.

An arm 20 having its rear end connected to the contact 13 extendslongitudinally through'the base 10 into the bulb B beyond the forwardend of the arm 18 and has its forward end bent transversely of the axisof the bulb and connected to' one end 'of the dimmer or courtesyfilament 22, whose opposite end is connected to and supported by theportion 16 of the arm 15. T1118 filament, as before stated, constitutesthe dimer or courtesy filament and preferably is of a less capacitythan-the filament 19, and, as shown, is supported outwardly and beyondthe focal point of the reflector 28, as will presently appear. J

The truncated pyramidal deflector or reflector 23, which is here shownmade, of a reflecting metal, but which, however, may be made ofporcelainor any desired translucent or opaque material, or'be colored in anymanner that may be desired, is attached to and'supported by the .15, itbeing here shown as provided at its rear end with two clamping fingersor lugs 24 which are bent around the portion 16 of the arm 15 and alsohaving one of its longitudinal edges 25 bent around theforwardly-projecting portion 17 of the arm 15. Thus the deflector orreflector is supported with its concavity facing the filament 22, and insuch a position as to deflect or reflect the rays from said filament toone side. This deflector has its forward end curved to form an auxiliarydeflector 26 to act as additional means for providing the necessaryprojection of the rays of light from the filament 22.

As shown in Figures 3 and 7, the filament 22 and reflector 23 are solocated in the bulb that when the bulb is mounted in the socket light,as is the usual practice,

- 27 of a reflector support S, the body of the deflector 23 will bedisposed below the axis of the parabolic reflector 28 of the automobilelamp or headlight, with its concavity directed toward the filament 22and the filament 22 and reflector 23 will be located in advance of thefocal oint of the reflector 28, so that the rays 0 light generated bythe filament 22 will follow the broken lines 30 (Figure 7) and thus beprojected downwardly upon the surface traversed and not produce a glarein the eyes of the driver of an approaching vehicle.

The filament 19, as illustrated, is so located in the bulb that it willbe at the focal point of the reflector 28 and rays therefrom will followthe dot-and-dash lines 29 (Figure 7 and be projected forwardly so as toproduce a bright light for ordinary driving. The filaments 19 and 22 areadapted to be illuminated independently so that the operator of themotorcar may, upon an approach of a vehicle, deenergize the filament 19and energ-ize the filament 22, thus eliminating the right light andenergizing the courtesy light, which will project ample light rays fromthe reflector upon the ground immediately in front of his motorcar. Inthis manner, the danger of eliminating too rapidly the rays of light inthe cutting out of the bright light andcutting in of the dimmer isavoided and the safety problem indriving at night is more or lesssolved.

In Figure 4, the contacts 13 and 14' are shown as out of alinement withthe socket-. engaging pins 12', this providing a means whereby, when thelamp is mounted within the socket 27, the reflector 23 is slightlytilted, soas to cause the rays reflected therefrom to be deflecteddownwardly and toward the right or left, according to the custom of thecountry. 1

From the foregoing description, taken in connection with the drawings,it is evident that with an electric lamp constructed according to andembodying the present invention, the same may be readily substituted fornecessary is the provision in the socket 27 of two separate lead-inwires for the contacts 13 and 14 to control the respective filaments 19and 22, so that with this type of lamp the lenses of the headlight maybe of ordinary glass instead of specially constructed nonglare types,asare now in use.

It is also evident that by locating the filament 19 to the rear of thedimmer filament 22 and opposite the focal point of the reflector 28, thebest possible results are obtained for straight driving, and that thedeflector 23 for the filament 22 so positioned will not interfere, toany extent, with the ordinary driving light, yet at the same time, whenthe filament 19 is de-energized and the filament 22 is energized, thedesired direction of the rays from the filament 22 will be so projectedas not to interfere with the approaching driver and at the same timegive ample protection to the operating driver.

I claim 1. An electric lamp comprising a translucent bulb, a base ofnon-conducting material having three contacts on its exterior, a leadhaving its rear end connected to one of said contacts and extending intothe bulb with its forward end bent transversely to the axis of the bulb,a second lead having its rear end connected to another of said contactsand extending into said bulb with its forward end terminating short ofthe forward end of the first-named lead, a third lead having its rearend connected to the third contact and extending into the bulb, saidthird lead having its forward end bent transversely of the axis of thebulb between the transversely bent portion of the first lead and theforward end of the second lead and then bent forwardly in the samegeneral direction as the axis of the bulb, a filament having its forwardend connected to the first lead and its rear end connected to the thirdlead, a second filament extending between. said second and third leads,and a reflector having a pair of edges disposed at an angle to oneanother with one of said edges connected to the transversely bentportlon of the third lead and the other of said edges connected to theforwardly bent portlon of the third lead and with its reflectmg surfacedirected toward said first filament.

2. An electric lamp comprising a translucent bulb, a base ofnon-conducting material having three contacts on its exterior,.a leadhaving its rear end connected to one of said.

contacts and extending into the bulb with its forward end benttransversely to the axis of its rear end connected to the third contactand extending into the bulb, said third lead having its forward end benttransversely of the axis of the bulb between the transversely bentportion of the first lead and the forward end of the second lead andthen bent forwardly substantially parallel with the axis of the bulb, afilament having its forward end connected to the first lead and its rearend connected to the third lead, a second filament extending betweensaid second and third leads, and a reflector of substantiallyfrusto-pyramidal form having its rear edge connected to the transverselybent portion of the third lead and one of its longitudinal edgesconnected to the forwardly bent portion of the third lead with itsconcaved surface directed toward said first filament.

3. An electric lamp according to claim 1 wherein the reflector has aportion of its edge which is connected to the transversely bent ortionof the third lead cut away and the first filament has its rear endconnected to the transversely bent portion of the third lead at said cutaway portion of the reflector.

In testimony whereof I have hereunto set In hand.

y JOHN HAMBERGER.

